Journal
MATERIALS
Volume 11, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/ma11122380
Keywords
time-delayed femtosecond lasers; orthogonal polarizations; subwavelength triangular structures; tungsten
Categories
Funding
- National Natural Science Foundation of China [1750205, 11674178, 11747101]
- Natural Science Foundation of Tianjin City [17JCZDJC37900]
- Natural Science Foundation of Henan Province [182102210484, 18A416003]
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences
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We present a mask-free strategy for fabricating two-dimensional subwavelength periodic triangular arrays on tungsten, by focusing two orthogonally polarized and temporally delayed femtosecond laser beams using a cylindrical lens. In stark contrast to the commonly observed structures of either a single ablation spot or a one-dimensional grating, we obtained highly uniform periodic triangular arrays on the laser-exposed surface, with three equilateral sides each of 480 nm in length and about 100 nm in modulation depth. The triangular features varied with both the laser energy and the scanning speed. We found that the optical reflectivity of such a surface reduces significantly within the spectral range of 700-2500 nm. The triangular structure morphology can also be controlled by varying the time delay between the two laser beams.
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